Category:Jacques Philippe Marie Binet

English:Jacques Philippe Marie Binet (February 2, 1786 – May 12, 1856) was a French mathematician, physicist and astronomer born in Rennes; he died in Paris, France, in 1856. He made significant contributions to number theory, and the mathematical foundations of matrix algebra which would later lead to important contributions by Cayley and others. In his memoir on the theory of the conjugate axes and of the moment of inertia of bodies he enumerated the principle now known as Binet's theorem. He is also recognized as the first to derive the rule for multiplying matrices in 1812, and Binet's formula expressing Fibonacci numbers in closed form is named in his honour, although the same result was known to Abraham de Moivre a century earlier.